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Finding the Third Proportional to 310,439 and 679,000

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Solution

The third proportional to 310,439 and 679,000 is: 1,485,125.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,439 : 679,000 = 679,000 : x
  2. Step 2: Convert to fraction form
    310,439/679,000 = 679,000/x
  3. Step 3: Cross multiply
    310,439x = 679,000 × 679,000
  4. Step 4: Simplify right side
    310,439x = 461,041,000,000
  5. Step 5: Solve for x
    x = 461,041,000,000/310,439
  6. Step 6: Final answer
    x = 1,485,125.90

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Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.